Method and apparatus for monitoring a urea injection system...

Details Method and apparatus for monitoring a urea injection system... Method and apparatus for monitoring a urea injection system...

2006-07-25

2009-11-03

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S277000, C060S297000, C060S301000, C060S303000

Reexamination Certificate

active

07610750

ABSTRACT:
A monitoring system for an exhaust aftertreatment system is provided, comprising an injecting device operable to inject reductant into an exhaust gas feedstream upstream of a selective catalyst reduction device. The monitoring system comprises a control module, adapted to selectively intrusively control a rate of dosing from the injecting device and, monitor inputs from a sensing device. The sensing device can comprise an ammonia sensor, and, alternatively, a NOx sensor. The control module is adapted to discontinue the rate of dosing, and substantially increase and decrease the rate of dosing for a predetermined amount of time, and to identify a fault in the sensing device and the selective catalyst reduction device.

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